<%--
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  User: Administrator
  Date: 2021/11/14
  Time: 15:06
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--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body onload="load();">
<script>
    window.onload = function () {
        alert("用户已存在");
        window.history.go(-1);
    }
</script>

<h1>错误</h1>
</body>
</html>
